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		<style>
			body,ul{margin:0;padding:0;}
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				width:1000px;
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			/* 	background-color: pink; */
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				width:200px;
				height:1000px;
				/* background-color: red; */
				border:1px solid transparent;
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			.container ul li{
				margin:15px 20px 0 ;
				width:150px;
				height:30px;
				background-color:#ddd;
				line-height:30px;
				text-align:center;
			}
			.container ul li a{
				color:#000;
			}
			.container .top{
				margin-bottom:20px;
				float:left;
				width:794px;
				height:150px;
			/* 	background-color: green; */
				border:1px solid #ccc;
			}
			.container .bottom{
				width:794px;
				height:700px;
			/* 	background-color: hotpink; */
				border:1px solid #ccc;
			}
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		<div class='container'>
			<ul>
				<li><a href="01/homework.html" target='a'>第一章</a></li>
				<li><a href="02/homework.html"  target='a'>第二章</a></li>
				<li><a href="03/homework.html"  target='a'>第三章</a></li>
				<li><a href="04/homework.html"  target='a'>第四章</a></li>
				<li><a href="05/homework.html"  target='a'>第五章</a></li>
				<li><a href="06/homework.html"  target='a'>第六章</a></li>
				<li><a href="07/homework.html"  target='a'>第七章</a></li>
				<li><a href="08/homework.html"  target='a'>第八章</a></li>
				<li><a href="09/homework.html"  target='a'>第九章</a></li>
				<li><a href="10/homework.html"  target='a'>第十章</a></li>
				<li><a href="11/homework.html"  target='a'>第十一章</a></li>
				<li><a href="12/homework.html"  target='a'>第十二章</a></li>
				<li><a href="13/homework.html"  target='a'>第十三章</a></li>
				<li><a href="15/homework.html"  target='a'>第十五章</a></li>
				<li><a href="16/homework.html"  target='a'>第十六章</a></li>
				<li><a href="17/homework.html"  target='a'>第十七章</a></li>
				<li><a href="18/homework.html"  target='a'>第十八章</a></li>
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